How to fix "wget: unable to resolve host address" issue
If wget reports unable to resolve host address, first test network connectivity, then check whether wget is trying IPv6 on a machine without IPv6 access.
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DNS.
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Definition of DNS status: NXDOMAIN, NOERROR and SERVFAIL
NXDOMAIN, NOERROR, and SERVFAIL are DNS query statuses. Understanding them helps interpret what happened when looking up domain records.
How to improve DNS lookups on Linux system
Listing multiple DNS servers in /etc/resolve.conf defines primary and secondary DNS servers. If the primary fails, the system switches to the secondary after a timeout.